Figure 12
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(a) Map of Nigeria showing IPP tracks of PRNs in view during post-sunset hours, 11 July 2022. The IPP track of PRN 30, which recorded the maximum S4 index over the dip equator, is shown by the black arrow. (b) Filtered sTEC from PRN 30 during post-sunset hours. (c) FFT of Δ sTEC from PRN 30 over the interval ~2000–2100 UT. (LT = UT + 1).
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